Is it possible for a prophet to add to the Torah, or change any of it? Can a prophet say that God has told him that certain parts no longer apply or are wrong? How do we know?
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The answer is no. In Yehoshua 23:6, Yehoshua says to the people:
In Deuteronomy 4:2
Finally, and perhaps most significantly, Rambam writes in his Mishneh Torah
All of these sources clearly show that nothing may be added or subtracted from the Torah. Even someone who claims to be a prophet may never do so, and to attempt to do so will show him to be a false prophet.
The Bavli records (Temurah 16a):
That said, later authorities do have a number of interesting powers (when not claiming to be doing so under direct divine order) including directing Jews to not perform certain mitzvot when done passively (שב ואל תעשה), removing certain principles from the Torah (יש כח ביד חכמים לעקור דבר מן התורה), redistributing wealth at will (הפקר בית דין הפקר), and temporary permission to violate any prohibition except Avoda Zara (הוראת שעה).
The 9th Ani Maamin - which are based on the 13 principals that the Rambam in his Hakdama to his Pirush on Perek Chelek in Mesechtas Sanhedrin mentions as the points of belief a Jew must have - states that there will be no changes to the Torah.
אני מאמין באמונה שלימה שזאת התורה לא תהא מוחלפת ולא תהא תורה אחרת מאת הבורא יתברך שמו.